3/27/2019 0 Comments Chem Factsheets Pdf FreeA Level Chemistry will give you an exciting insight into the. It covers the key concepts of chemistry and practical skills are. Enthalpy, entropy and free energy. A2 Chemistry Factsheets: Amino Acids • 1. Zwitterion: A dipolar ionic form of an amino acid. A zwitterion is formed by the donation of a hydrogen from the carboxylic group to the amino group. Due to both charges being present, there is no overall charge on the molecule. Isoelectric Point: The PH value at which the amino acid exists as a zwitterion. AMINO ACIDS OCR F324 Chemistry Factsheet Amino acids are the building blocks for peptides and proteins. Amino acids consist of 2 Carbons, an acidic carboxyl group (carboxylic acid), basic amine group, a hydrogen and variable R group. Zwitterions A zwitterion is an internal salt. A proton is transferred from the COOH (carboxyl) group to the amino (NHH) group. The carboxylic acid is slightly acidic and the amino group has slightly basic qualities, so by nature of a base, the amino group accepts the proton. The zwitterion of an amino acid only exists at the isoelectric point (a specific PH value). The PH values can vary. Lower PH A more acidic PH Amino acid behaves as a base, accepting a proton from the acid. Higher PH A more alkaline PH Donates a proton to the base Forms a negative ion.
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